Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 928 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.440 increased by 15% =
2. 2.575 decreased by 8% =
3. 3.300 decreased by 15% =
4. 4.700 increased by 10% =
5. 5.625 increased by 12% =
6. 6.392 decreased by 50% =
7. 7.500 decreased by 35% =
8. 8.375 increased by 12% =
9. 9.750 increased by 8% =
10. 10.140 decreased by 15% =
11. 11.175 increased by 12% =
12. 12.80 decreased by 5% =
13. 13.500 increased by 5% =
14. 14.756 increased by 25% =
15. 15.200 decreased by 40% =
16. 16.460 increased by 5% =
17. 17.420 decreased by 5% =
18. 18.708 decreased by 50% =
19. 19.150 decreased by 12% =
20. 20.552 increased by 50% =
21. 21.480 decreased by 75% =
22. 22.190 decreased by 50% =
23. 23.730 decreased by 10% =
24. 24.425 decreased by 40% =
25. 25.780 decreased by 15% =
26. 26.310 increased by 10% =
27. 27.210 increased by 10% =
28. 28.120 increased by 10% =
29. 29.340 decreased by 5% =
30. 30.200 increased by 12% =
31. 31.720 decreased by 35% =
32. 32.720 increased by 15% =
33. 33.80 decreased by 35% =
34. 34.40 decreased by 15% =
35. 35.84 decreased by 50% =
36. 36.554 increased by 50% =
37. 37.330 decreased by 30% =
38. 38.105 increased by 20% =
39. 39.432 decreased by 25% =
40. 40.440 increased by 5% =

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